Means for compensating generators or motors.



No. 698,245. Patented A rjzz, 1902.

- F. a. BAUM. MEANS FOR COMPENSATING GENERATORS 0R MOTORS.

- (No Model.)

INVENTOR WITNESSES:

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UNTTno STATES PATENT OTTTCE.

FRANK G. BAUM, OF STANFORD UNIVERSITY, CALIFORNIA, ASSIGNOR TO STANLEY ELECTRIC MANUFACTURING COMPANY, OF PITTSFIELD, MAS- SACHUSETTS, A CORPORATION OF NEW JERSEY.

MEANS FOR COlvl ENsATlNG GENERATORS OR MOTORS.

SPECIFICATION forming part of Letters Patent No. 698,245, dated April 22, 1902.

Application filed September 5, 1901. Serial No. 74,374. (No'modeh) To (tZZ whom it may concern;

Be it known that I, FRANK G. BAUM, a citizen of the United States, residing at Stanford University, California, have invented certain new and useful Improvements in Means for Compensating Generators or Motors, of which the following is a full, clear, and exact description.

My invention relates to the compensation of generators and motors, and has for its object to produce a more efficient and simple means for accomplishing such compensation and one which is more easily manipulated than those heretofore used.

In carrying out my invention in connection with generators I employ an auxiliary machine which supplies the whole or part of the exciting-current of the main generators. This machine runs at a substantially constant speed and is energized by the current in the main circuit so as to respond to changes in the load carried by the main generators and more highly energize the maingenerator field-magnets as the load increases.

The followingis adescription of my invention, reference being had to the accompanying drawings, in which- Figure 1 represents diagrammatically one embodiment of my invention, and Fig. 2 is a 0 modification of the same.

Referring to the drawings, A A are two continuous-current generators in parallel, B B being the armatures, C C the field-energizing coils, D D the mains, and LLthe lamps 3 5 or other translating devices constituting the load on the system.

E is an auxiliary generator or compensator running at a constant speed and having a shunt-winding F and an additional winding G in series with the load L. From the brushes of this compensator are two leads H H, which supply the energizing-coils C C of the main generators A A, the coils C C being in parallel across the compensator-leads. It will 5 be seen that in the above arrangement as the load increases and the potential along the line tends to fall the increase of current in the coil G increases the compensator electromotive force and the current in the energizing-coils C C, which in turn increases the magnetism of the main-generator field-magnet and counteracts any tendency toward a drop in potential along the lines due to the increase of load. This system of compensation simplifies the construction of the generators and where two or more generators are installed has very substantial advantages since by the simple addition of the compensator the generators may be made with a single winding and the need of all equalizer connections is done away with, also the adjustment of low-resistance shunts, which must otherwise be made to make all machines take their proper proportion of the load. Moreover, with this arrangement there is no drop in potential when a new machine is added to one or more already running.

In the modification shown in Fig. 2 instead of compounding the compensator the energizing-coil on the main generators is connected in shunt to the armature, and the shuntcoil is omitted from the compensator fieldmagnet. In this arrangement the shunt-coil of the main genera-tor has a varying difference of potential due to the compensator im- 7 5 pressed upon its terminals, thereby compensating for any tendency toward change in potential due to change in load.

Referring more particularly to Fig. 2, M M are the main generators. N N are the arma- 8o tures connected to the mains O O. P P are the energizing-coils of the main generators. Q is the compensator having its field-magnet coil R in series with the load L and impressing an electromotive force on the energizingcoils P P which increases as the load on the system increases and results in proper variation in the magnetization of the main fieldmagnets.

Nhat I claim is- 1. In a system of distribution, the combination of a pluralityof dynamo-electric machines having but one energizing-winding on each of their field-magnets, and an auxiliary dynamo-electric machine in circuit with the 5 field-magnet windings and having an energizing-coil in series with the armature-circuits of the main dynamo-electric machines.

I Signed at Butte, illontnna, this 29th day of I July, 1901.

l FRANK e9 BAUM. 1 \Vitnesses:

PERCY B. DAWSON, RALPH DAWSON. 

